Watershed-Based Survey Designs |
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Authors: | Naomi E Detenbeck Dan Cincotta Judith M Denver Susan K Greenlee Anthony R Olsen Ann M Pitchford |
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Institution: | (1) U.S. Environmental Protection Agency, Office of Research and Development, 6201 Congdon Blvd., Duluth, Minnesota, USA;(2) WV Department of Natural Resources, Elkins, West Virginia, USA;(3) U.S. Geological Survey, 1289 McD Drive, Dover, Delaware, USA;(4) U.S. Geological Survey, EROS Data Center, Sioux Falls, South Dakota, USA;(5) U.S. Environmental Protection Agency, Office of Research and Development, 200 S.W. 35th Street, Corvallis, Oregon, USA;(6) U.S. Environmental Protection Agency, Office of Research and Development, Las Vegas, Nevada, USA |
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Abstract: | Watershed-based sampling design and assessment tools help serve the multiple goals for water quality monitoring required under
the Clean Water Act, including assessment of regional conditions to meet Section 305(b), identification of impaired water
bodies or watersheds to meet Section 303(d), and development of empirical relationships between causes or sources of impairment
and biological responses. Creation of GIS databases for hydrography, hydrologically corrected digital elevation models, and
hydrologic derivatives such as watershed boundaries and upstream–downstream topology of subcatchments would provide a consistent
seamless nationwide framework for these designs. The elements of a watershed-based sample framework can be represented either
as a continuous infinite set defined by points along a linear stream network, or as a discrete set of watershed polygons.
Watershed-based designs can be developed with existing probabilistic survey methods, including the use of unequal probability
weighting, stratification, and two-stage frames for sampling. Case studies for monitoring of Atlantic Coastal Plain streams,
West Virginia wadeable streams, and coastal Oregon streams illustrate three different approaches for selecting sites for watershed-based
survey designs. |
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Keywords: | delineation probability survey designs watershed classification watersheds |
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